Designing reservoirs for 1/t decoherence process in Jaynes-Cummings model

2012 ◽  
Author(s):  
F. Giraldi ◽  
F. Petruccione
Keyword(s):  
Decoherence Process

scholarly journals Decoherence and pointer states in small antiferromagnets: A benchmark test

2017 ◽  
Vol 2 (2) ◽  
Author(s):  
Hylke Donker ◽  
Hans De Raedt ◽  
Mikhail Katsnelson
Keyword(s):  
Quantum Measurement ◽  
The Self ◽  
Environment Interaction ◽  
Benchmark Test ◽  
System Environment ◽  
Preferred Basis ◽  
Measurement Limit ◽  
Pointer States ◽  
Decoherence Process

We study the decoherence process of a four spin-1/2 antiferromagnet that is coupled to an environment of spin-1/2 particles. The preferred basis of the antiferromagnet is discussed in two limiting cases and we identify two exact pointer states. Decoherence near the two limits is examined whereby entropy is used to quantify the robustness of states against environmental coupling. We find that close to the quantum measurement limit, the self-Hamiltonian of the system of interest can become dynamically relevant on macroscopic timescales. We illustrate this point by explicitly constructing a state that is more robust than (generic) states diagonal in the system-environment interaction Hamiltonian.

scholarly journals Gravitational Field effects on the Decoherence Process and the Quantum Speed Limit

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Sh. Dehdashti ◽  
Z. Avazzadeh ◽  
Z. Xu ◽  
J. Q. Shen ◽  
B. Mirza ◽  
...  
Keyword(s):  
Gravitational Field ◽  
Speed Limit ◽  
Field Effects ◽  
Decoherence Process

scholarly journals Decoherence, Anti-Decoherence, and Fisher Information

Entropy ◽  
2021 ◽  
Vol 23 (8) ◽  
pp. 1035
Author(s):  
Andres M. Kowalski ◽  
Angelo Plastino
Keyword(s):  
Fisher Information ◽  
Uncertainty Principle ◽  
Good Description ◽  
Information Geometry ◽  
Information Measure ◽  
Quantum Decoherence ◽  
Clear Insight ◽  
Decoherence Process ◽  
Insight Into ◽  
Fisher's Information

In this work, we study quantum decoherence as reflected by the dynamics of a system that accounts for the interaction between matter and a given field. The process is described by an important information geometry tool: Fisher’s information measure (FIM). We find that it appropriately describes this concept, detecting salient details of the quantum–classical changeover (qcc). A good description of the qcc report can thus be obtained; in particular, a clear insight into the role that the uncertainty principle (UP) plays in the pertinent proceedings is presented. Plotting FIM versus a system’s motion invariant related to the UP, one can also visualize how anti-decoherence takes place, as opposed to the decoherence process studied in dozens of papers. In Fisher terms, the qcc can be seen as an order (quantum)–disorder (classical, including chaos) transition.

scholarly journals DECOHERENCE IN QUANTUM COSMOLOGY AND THE COSMOLOGICAL CONSTANT

2013 ◽  
Vol 28 (34) ◽  
pp. 1350158 ◽  
Author(s):  
TORSTEN ASSELMEYER-MALUGA ◽  
JERZY KRÓL
Keyword(s):  
Cosmological Constant ◽  
Quantum State ◽  
Quantum Cosmology ◽  
Qualitative Agreement ◽  
Accelerated Expansion ◽  
Initial State ◽  
Decoherence Time ◽  
Fractal Space ◽  
Decoherence Process

We discuss a spacetime having the topology of S3×ℝ but with a different smoothness structure. The initial state of the cosmos in our model is identified with a wildly embedded 3-sphere (or a fractal space). In previous work we showed that a wild embedding is obtained by a quantization of a usual (or tame) embedding. Then a wild embedding can be identified with a (geometrical) quantum state. During a decoherence process this wild 3-sphere is changed to a homology 3-sphere. We are able to calculate the decoherence time for this process. After the formation of the homology 3-sphere, we obtain a spacetime with an accelerated expansion enforced by a cosmological constant. The calculation of this cosmological constant gives a qualitative agreement with the current measured value.

scholarly journals QUANTUM COHERENCE, CORRELATED NOISE AND PARRONDO GAMES

2002 ◽  
Vol 02 (04) ◽  
pp. L293-L298 ◽  
Author(s):  
CHIU FAN LEE ◽  
NEIL F. JOHNSON ◽  
FERNEY RODRIGUEZ ◽  
LUIS QUIROGA
Keyword(s):  
Quantum Coherence ◽  
Noise Source ◽  
Correlated Noise ◽  
Many Body ◽  
Markovian Dynamics ◽  
Decoherence Process

We discuss the effect of correlated noise on the robustness of quantum coherent phenomena. First we consider a simple, toy model to illustrate the effect of such correlations on the decoherence process. Then we show how decoherence rates can be suppressed using a Parrondo-like effect. Finally, we report the results of many-body calculations in which an experimentally-measurable quantum coherence phenomenon is significantly enhanced by non-Markovian dynamics arising from the noise source.

scholarly journals DECOHERENCE AND GRAVITATIONAL BACKGROUDS

2002 ◽  
Vol 17 (06n07) ◽  
pp. 1003-1012 ◽  
Author(s):  
SERGE REYNAUD ◽  
BRAHIM LAMINE ◽  
ASTRID LAMBRECHT ◽  
PAUOLO MAIA NETO ◽  
MARC-THIERRY JAEKEL
Keyword(s):  
Gravitational Waves ◽  
Effective Temperature ◽  
Planetary Motion ◽  
The Moon ◽  
The Earth ◽  
Gravitational Scattering ◽  
Decoherence Process ◽  
Very High ◽  
Negligible Influence

We study the decoherence process associated with the scattering of stochastic gravitational waves. We discuss the case of macroscopic systems, such as the planetary motion of the Moon around the Earth, for which gravitational scattering is found to dominate decoherence though it has a negligible influence on damping. This contrast is due to the very high effective temperature of the background of gravitational waves in our galactic environment.

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